Brassier is the author of Nihil Unbound: Enlightenment and Extinction and the translator of Alain Badiou's Saint Paul: The Foundation of Universalism and Theoretical Writings and Quentin Meillassoux's After Finitude: An Essay on the Necessity of Contingency. He first attained prominence as a leading authority on the works of François Laruelle.

Brassier is of mixed French-Scottish ancestry, and his family name is pronounced in the French manner.

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Along with Quentin Meillassoux, Graham Harman, and Iain Hamilton Grant, Brassier is one of the foremost philosophers of contemporary Speculative realism interested in providing a robust defence of philosophical realism in the wake of the challenges posed to it by post-Kantian critical idealism, phenomenology, post-modernism, deconstruction, or, more broadly speaking, "correlationism". Brassier is generally credited with coining the term "speculative realism," though Meillassoux had earlier used the phrase "speculative materialism" (matérialisme spéculatif) to refer to his own position.

Brassier himself, however, does not identify with the speculative realist movement, and, further, debates that there even is such a movement, stating "The 'speculative realist movement' exists only in the imaginations of a group of bloggers promoting an agenda for which I have no sympathy whatsoever: actor-network theory spiced with pan-psychist metaphysics and morsels of process philosophy. I don’t believe the internet is an appropriate medium for serious philosophical debate; nor do I believe it is acceptable to try to concoct a philosophical movement online by using blogs to exploit the misguided enthusiasm of impressionable graduate students. I agree with Deleuze’s remark that ultimately the most basic task of philosophy is to impede stupidity, so I see little philosophical merit in a ‘movement’ whose most signal achievement thus far is to have generated an online orgy of stupidity."[4]

Brassier is strongly critical of much of contemporary philosophy for what he regards as its attempt "to stave off the 'threat' of nihilism by safeguarding the experience of meaning – characterized as the defining feature of human existence – from the Enlightenment logic of disenchantment". According to Brassier, this tendency is exemplified above all by philosophers strongly influenced by Heidegger and Wittgenstein. Unlike more mainstream philosophers such as John McDowell, who would press philosophy into service in an attempt to bring about a "re-enchantment of the world", Brassier's work aims to "push nihilism to its ultimate conclusion".

According to Brassier, "the disenchantment of the world understood as a consequence of the process whereby the Enlightenment shattered the 'great chain of being' and defaced the 'book of the world' is a necessary consequence of the coruscating potency of reason, and hence an invigorating vector of intellectual discovery, rather than a calamitous diminishment".[5] "Philosophy", exhorts Brassier, "would do well to desist from issuing any further injunctions about the need to re-establish the meaningfulness of existence, the purposefulness of life, or mend the shattered concord between man and nature. It should strive to be more than a sop to the pathetic twinge of human self-esteem. Nihilism is not an existential quandary but a speculative opportunity."[6]

Brassier's work has often been associated with contemporary philosophies of nihilism and pessimism. In an interview with True Detective creator and writer Nic Pizzolatto, Brassier's Nihil Unbound is cited as an influence on the TV series, along with Thomas Ligotti's The Conspiracy Against the Human Race, Jim Crawford's Confessions of an Antinatalist, Eugene Thacker's In The Dust of This Planet, and David Benatar's Better Never To Have Been.[7]